Synopsis: The calcium and strontium terahydrate salts of (glycinato)oxidobis(peroxido)vanadate(V) crystallized at pH ca 7.4 with similar lattice parameters. The glycinate anion acts as a bidentate N,O-chelating ligand, and the V atom has a penta­gonal bipyramidal geometry, with two 2-peroxide groups and the glycinate N atom in the equatorial plane, and one terminal oxo and a glycinate O atom at the axial positions.